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Feb28-12, 06:26 AM
Ground as in electrical ground or separate thing to ground to?
I.e. it's a piece of metal that is only connected to the cable shielding, or a piece of metal connected to the ground wire?
Because ground for the amp = ground for the batteries = ground for everything.
Ground is electrical ground, the ground you ground the +ve input of the op-amp, or the ground on the cathode of the PD. You need a plane to provide better noise shielding.